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EWE to convert salt caverns into huge battery

The two German salt caverns were previously used to store gas but will now be made into a 700 MWh redox flow batteryThe two German salt caverns were previously used to store gas but will now be made into a 700 MWh redox flow battery.

The two salt caverns at Jemgum in Germany were previously used to store gas. (EWE-Gassspiecher)

German energy company EWE plans to convert two salt caverns, currently used to store gas, into a battery. The battery will be the largest electrochemical storage device of its kind and the first to use a salt cavern.

The caverns to be converted are part of an eight-cavern cluster at Jemgum in northwestern Germany. If successful, the project – known as brine4power – will be able to store 700 MWh of electricity, equivalent to one hour of Berlin’s energy consumption.

It will use ‘redox flow’ battery technology,...

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